Gas Tank Restoration - douging

Before providing the engine with new gasoline I checked in the tank. I spotted some rust inside the tank, which won't provide reliable fuel supply if the rust blocks the fuel line.

The tank is an aftermarket replacement made by Tankauto. The metal seems a bit on the thin side. Any more serious rust and there is not much buffer before the tank rusts through. Luckily, this tank is not so bad. I think I caught it just in time. There is a small pinhole leak on the underside that should fill in with the sealant.

I also wanted to check the condition of the tank and of the floor under the tank. There was a lot of surface rust on the underside of the tank. The carpet used to isolate the tank from the chassis was also damp, moldy, and crumbling.

The floor is ordinary sheet, clearly a replacement for the original. It, too, was badly rotted at the rear and with surface rust.

I'll be using the KBS Coatings Tank Seal kit on this. I've used KBS products on a bunch of other products and the finished result is usually fantastic.

Photos

  • Gas Tank

    Gas tank before its first wash. 2019

  • Gas Tank

    Gas tank after its first wash. 2019

  • Gas Tank

    Underside of the tank after first wash. 2019

  • Gas Tank

    One small pinhole leak on the underside. It should be filled with the KBS Tank Seal and I won't need epoxy or weld. 2019

  • Gas Tank

    Gas tank after wash and degreaser. Now to air dry and then treat the rust with KBS Blast. 2019

  • Gas Tank

    Inside of the tank after wash and degreaser. 2019

  • Gas Tank

    We have achieved Zinc Phosphate reaction! KBS Rust Blast initiates a chemical reaction with rust that makes it inert. The white residue is Zinc Phosphate and is the telltale sign chemical reaction has occurred. Adios rust! 2019

  • Gas Tank

    We have achieved Zinc Phosphate reaction! KBS Rust Blast initiates a chemical reaction with rust that makes it inert. The white residue is Zinc Phosphate and is the telltale sign chemical reaction has occurred. Adios rust! This is the internal partition of the tank. 2019

  • Gas Tank

    Pinholes patches with JB Weld SteelStick. This batch was in my toolbox and was more difficult to work with than usual. I couldn’t get it flatter and smoother and it required a lot of sanding.

  • Gas Tank

    KBS Tank Seal at work. This is a puddle still collecting over an hour after my initial pour. I should have given it more time to drain but the internal baffle made that impossible. I’ll just continue rotating the tank every few minutes until it’s evenly coated and sets. Tip for anyone else: get a coat layer on all surfaces in the first 5-8 minutes. Then start working the excess towards your drain/neck ASAP. If you think it's all drained, think again! It moves so slowly that it's probably puddled somewhere and you don't even know it.

  • Gas Tank

    This coating might be too thin. This is rusty metal showing. I guess some coat is better than none. And better than before. I think the KBS should be thicker for longer. Or I should have cut open the tank and coated it.